/*
 * Zed Attack Proxy (ZAP) and its related class files.
 *
 * ZAP is an HTTP/HTTPS proxy for assessing web application security.
 *
 * Copyright 2012 The ZAP Development Team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.zaproxy.zap.extension.httppanel.view.impl.models.http.response;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import org.apache.log4j.Logger;
import org.parosproxy.paros.network.HttpHeader;
import org.parosproxy.paros.network.HttpMalformedHeaderException;
import org.zaproxy.zap.extension.httppanel.view.impl.models.http.AbstractHttpStringHttpPanelViewModel;
import org.zaproxy.zap.extension.httppanel.view.impl.models.http.HttpPanelViewModelUtils;

public class ResponseStringHttpPanelViewModel extends AbstractHttpStringHttpPanelViewModel {

    private static final Logger logger = Logger.getLogger(ResponseStringHttpPanelViewModel.class);

    @Override
    public String getData() {
        if (httpMessage == null || httpMessage.getResponseHeader().isEmpty()) {
            return "";
        }

        return httpMessage.getResponseHeader().toString().replaceAll(HttpHeader.CRLF, HttpHeader.LF)
                + getBody();
    }

    private String getBody() {
        if (HttpHeader.GZIP.equals(
                httpMessage.getResponseHeader().getHeader(HttpHeader.CONTENT_ENCODING))) {
            // Uncompress gziped content
            try {
                ByteArrayInputStream bais =
                        new ByteArrayInputStream(httpMessage.getResponseBody().getBytes());
                GZIPInputStream gis = new GZIPInputStream(bais);
                InputStreamReader isr = new InputStreamReader(gis);
                BufferedReader br = new BufferedReader(isr);
                StringBuilder sb = new StringBuilder();
                String line = null;
                while ((line = br.readLine()) != null) {
                    sb.append(line);
                }
                br.close();
                isr.close();
                gis.close();
                bais.close();
                return sb.toString();
            } catch (IOException e) {
                // this.log.error(e.getMessage(), e);
                System.out.println(e);
            }
        }
        return httpMessage.getResponseBody().toString();
    }

    @Override
    public void setData(String data) {
        String[] parts = data.split(HttpHeader.LF + HttpHeader.LF);
        String header = parts[0].replaceAll("(?<!\r)\n", HttpHeader.CRLF);
        // Note that if the body has LF, those characters will not be replaced by CRLF.

        try {
            httpMessage.setResponseHeader(header);
        } catch (HttpMalformedHeaderException e) {
            logger.warn("Could not Save Header: " + header, e);
        }

        if (parts.length > 1) {
            String body = data.substring(parts[0].length() + 2);
            if (HttpHeader.GZIP.equals(
                    httpMessage.getResponseHeader().getHeader(HttpHeader.CONTENT_ENCODING))) {
                // Recompress gziped content
                try {
                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    GZIPOutputStream gis = new GZIPOutputStream(baos);
                    BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(gis, "UTF-8"));
                    bw.write(body);
                    bw.close();
                    gis.close();
                    baos.close();
                    httpMessage.getResponseBody().setBody(baos.toByteArray());
                    HttpPanelViewModelUtils.updateResponseContentLength(httpMessage);
                } catch (IOException e) {
                    // this.log.error(e.getMessage(), e);
                    System.out.println(e);
                }
            } else {
                httpMessage.setResponseBody(body);
            }
        } else {
            httpMessage.setResponseBody("");
        }
        HttpPanelViewModelUtils.updateResponseContentLength(httpMessage);
    }
}
